Stone-crusher.



PATENTED DEC. 31. 1907.

G. R. STARNES.

STONE GRUSHER.

APPLICATION FILED MAR. 7, 190B.

2 SHEETS-SHEET 1.

[NVENTOR WITNESSES:

No. 875,638. PATENTED DEC. 31, 1907.

rm: l5 PETERS co., WASHINGTON. l:- c,

UNITED STATES PATENT OFFICE.

GREEN R. STARNES, OF CHARLOTTE, NORTH CAROLINA, ASSIGNOR OF ONE-HALF TO HENRY C. LITTLE, OF CHARLOTTE, NORTH CAROLINA.

STONE-CRUSHER.

Specificationof Letters Patent.

Patented Dec. 31, 1907.

T 0 all whom it may concern:

Be it known that I, GREEN R. STARNEs, a

citizen of the United States, residing at i are secured to the sides of the casing and Charlotte, in the county of ll'lecklenburg and the heads of key-bolts '10 extending through and secured to the jaws 5. Check plates 11 against the working faces of the jaws 5 and State of North Carolina, have invented a I these cheek plates are lapped by swinging jaws 12 which are suspended at their upper new and useful Stone-Crusher, of which the following is a specification.

This invention relates to stone crushlng apparatus and its object is to provide a de l vice of this character utilizing swinging jaws to be operated alternately by a power shaft common to both jaws.

A still further object is to provide a crushing machine of this character which has double the capacity of a machine utilizing a single pair of crushing dies without, however, necessitating an increase of power for oper ating it.

With the above and other objects in view the invention consists of a casing in which are disposed stationary dies. A swinging die is adapted to operate with each of the stationary dies and interposed between the swinging dies are converging pivoted tumblers which bear upon opposite portions of an eccentric and are adapted to be swung thereby in opposite directions alternately. Controlling springs are connected to the swinging dies and tumblers for the purpose of regulating the operation of the machine.

The invention also consists of certain other novel features of construction and combinations of parts which will be hereinafter more fully described and pointed out in the claims.

In the accompanying drawings is shown the preferred form of the invention.

In said drawings, Figure 1 is a perspective view of the machine; and Fig. 2 is a section through the crushing machanism.

Referring to the figures by numerals of reference 1 is a box-like casing supported at its ends upon wheels 2, the forward wheels being preferably connected to a pivoted. truck 3 which is secured to the casing by means of arms 4. The bottom of the casing is open and formed within said casing at the ends thereof are stationary jaws 5 the lower end of one of which is grooved as shown at 6 to receive the rear axle 7 of the machine. The inner or working face of each jaw 5 has a recess 8 therein, the lower walls of which are adapted to overlap the lower beveled edges of dies 9. The upper edges of these dies are also beveled but are overlapped by ends from shafts 13 which extend transl versely ofthe casing and are journaled in sectional bearings 14, the caps 15 of which i may be readily removed. Each of the swinging jaws has a recess 16 in its working face which constitutes a seat for a die 17. The upper and lower edges of the die are beveled and the lower wall of the recess 16 is adapted to overlap the lower beveled edge of the die while the upper edges of seated die is engaged and retained by key-bolts 18 which are secured within the jaws 12.

Rub irons 19 are secured across the sides of ed to contact with the cheek plates so as to reduce wear to the minimum. Ears 20 extend from the lower end of each jaw 12 and a rod 21 is secured between them and is slide ably mounted in a bracket 22. A head 23 is fastened to one end of the rod 21 and spring 24 is interposed between this head and the bracket for the purpose of exerting a constant pressure against the head '23 and to normally pull the lower end of its swinging jaw 12 away from the adjoining stationary jaw. It will, of course, be understood that one of these spring pressed rods 21 is used with each of the swinging jaws and the two rods preferably extend toward each other.

A dove-tailed recess 25 is formed in each swinging aw in rear of its die 17 and seated within each of these recesses is a block 26 having a recessed working face in which is seated one end of a plunger 27. Said plunger is slidably mounted in a guide 28 secured to the side of the casing.

A shaft 29 extends transversely of the easing adjacent the lower end of each of the swinging jaws 12, said shafts being mounted at their ends in sectional boxes 30 which are mounted upon the sides of the casing as shown. Mounted on each of these shafts is an upstanding tumbler 31 having a dovetailed recess 32 in that face thereof adjoining the swinging jaw 12. In this recess is a block 33 having a recessed working face in which bears one end of the plungers 27. This plunger may be in the form of a strip extending throughout the width of the casing jaws 12 near their lower ends and are adaptp or if desired, one plunger in the form of a heavy bar may be located adjacent each side of the casing.

Sectional bearings 34 are secured to the upper portions of the tumblers 31 and rollers of the shaft and adapted to receive power from any suitable mechanism not shown. Rollers 35 are held in contact with the eccentric by means of springs 41. which are interposed between brackets 42 and heads 43. These heads are located at one end of hooked rods 44 which engage eyes 45 upon the respective tumblers '31. Oil cups 46 are suitably disposed upon the swinging jaws and tumblers for the purpose of lubricating the various bearings.

In operation the shaft 37 is rotated by any suitable mechanism and the eccentric 36 will alternately swing the tumblers 31. in opposite directions and toward their respective swinging jaws 12. This movement of the tumblers will be transmitted through the plungers 27 to the swinging jaws and as the plungers are located close to the fulcrums of the tumblers a considerable leverage is obtained; said leverage being increased because the plungers bear against the swinging jaws at a point .considerably removed from the shafts 13. The springs 41 serve to hold the rollers 35 constantly in contact with. the eccentric 36 and the springs 24 serve to pull the swinging jaws 12 against the plungers and hold said plungers firmly' clamped between the blocks 26 and 33. It will be obvious that while one of the swinging jaws is moving toward its stationary jaw the other jaw 12 is swinging away from its cooperative stationary jaw. By feeding material to the two pairs of jaws alternately it will be apparent that a continuous crushing operation is produced, one pair of jaws operating upon the material while the other pair is opening to 7 receive fresh material. As only one of the jaws is crushing material at any time and as both of the swinging jaws are operated from the same shaft it will be understood that no more power is required to actuate the two swinging jaws alternately than is necessary for operating a single jaw. The entire machine can be readily transported from place to place and will be found of considerable service in repairing and building roads.

l/Vhat is claimed is1- A portable crusher comprising a wheel supported casing having oppositely disposed fixed jaws, oppositely movable jaws cooperating therewith, each of said movable jaws being pivotally mounted. adjacent its upper end, a power shaft extending transversely within the upper portion of the center of the casing, a cam. upon the shaft and within the 

